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block/vhdx: Don't take address of fields in packed structs 

Taking the address of a field in a packed struct is a bad idea, because
it might not be actually aligned enough for that pointer type (and
thus cause a crash on dereference on some host architectures). Newer
versions of clang warn about this. Avoid the bug by not using the
"modify in place" byte swapping functions.

There are a few places where the in-place swap function is
used on something other than a packed struct field; we convert
those anyway, for consistency.

Patch produced with scripts/coccinelle/inplace-byteswaps.cocci.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
pull/77/head
Peter Maydell 8 years ago
committed by Kevin Wolf
parent
c317b646d7
commit
1229e46d3c
4 changed files with 76 additions and 76 deletions
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  1. 118
      block/vhdx-endian.c
  2. 4
      block/vhdx-log.c
  3. 18
      block/vhdx.c
  4. 12
      block/vhdx.h

118
block/vhdx-endian.c
View File

@ -35,18 +35,18 @@ void vhdx_header_le_import(VHDXHeader *h)
{
assert(h != NULL);
le32_to_cpus(&h->signature);
le32_to_cpus(&h->checksum);
le64_to_cpus(&h->sequence_number);
h->signature = le32_to_cpu(h->signature);
h->checksum = le32_to_cpu(h->checksum);
h->sequence_number = le64_to_cpu(h->sequence_number);
leguid_to_cpus(&h->file_write_guid);
leguid_to_cpus(&h->data_write_guid);
leguid_to_cpus(&h->log_guid);
le16_to_cpus(&h->log_version);
le16_to_cpus(&h->version);
le32_to_cpus(&h->log_length);
le64_to_cpus(&h->log_offset);
h->log_version = le16_to_cpu(h->log_version);
h->version = le16_to_cpu(h->version);
h->log_length = le32_to_cpu(h->log_length);
h->log_offset = le64_to_cpu(h->log_offset);
}
void vhdx_header_le_export(VHDXHeader *orig_h, VHDXHeader *new_h)
@ -80,68 +80,68 @@ void vhdx_log_desc_le_import(VHDXLogDescriptor *d)
{
assert(d != NULL);
le32_to_cpus(&d->signature);
le64_to_cpus(&d->file_offset);
le64_to_cpus(&d->sequence_number);
d->signature = le32_to_cpu(d->signature);
d->file_offset = le64_to_cpu(d->file_offset);
d->sequence_number = le64_to_cpu(d->sequence_number);
}
void vhdx_log_desc_le_export(VHDXLogDescriptor *d)
{
assert(d != NULL);
cpu_to_le32s(&d->signature);
cpu_to_le32s(&d->trailing_bytes);
cpu_to_le64s(&d->leading_bytes);
cpu_to_le64s(&d->file_offset);
cpu_to_le64s(&d->sequence_number);
d->signature = cpu_to_le32(d->signature);
d->trailing_bytes = cpu_to_le32(d->trailing_bytes);
d->leading_bytes = cpu_to_le64(d->leading_bytes);
d->file_offset = cpu_to_le64(d->file_offset);
d->sequence_number = cpu_to_le64(d->sequence_number);
}
void vhdx_log_data_le_import(VHDXLogDataSector *d)
{
assert(d != NULL);
le32_to_cpus(&d->data_signature);
le32_to_cpus(&d->sequence_high);
le32_to_cpus(&d->sequence_low);
d->data_signature = le32_to_cpu(d->data_signature);
d->sequence_high = le32_to_cpu(d->sequence_high);
d->sequence_low = le32_to_cpu(d->sequence_low);
}
void vhdx_log_data_le_export(VHDXLogDataSector *d)
{
assert(d != NULL);
cpu_to_le32s(&d->data_signature);
cpu_to_le32s(&d->sequence_high);
cpu_to_le32s(&d->sequence_low);
d->data_signature = cpu_to_le32(d->data_signature);
d->sequence_high = cpu_to_le32(d->sequence_high);
d->sequence_low = cpu_to_le32(d->sequence_low);
}
void vhdx_log_entry_hdr_le_import(VHDXLogEntryHeader *hdr)
{
assert(hdr != NULL);
le32_to_cpus(&hdr->signature);
le32_to_cpus(&hdr->checksum);
le32_to_cpus(&hdr->entry_length);
le32_to_cpus(&hdr->tail);
le64_to_cpus(&hdr->sequence_number);
le32_to_cpus(&hdr->descriptor_count);
hdr->signature = le32_to_cpu(hdr->signature);
hdr->checksum = le32_to_cpu(hdr->checksum);
hdr->entry_length = le32_to_cpu(hdr->entry_length);
hdr->tail = le32_to_cpu(hdr->tail);
hdr->sequence_number = le64_to_cpu(hdr->sequence_number);
hdr->descriptor_count = le32_to_cpu(hdr->descriptor_count);
leguid_to_cpus(&hdr->log_guid);
le64_to_cpus(&hdr->flushed_file_offset);
le64_to_cpus(&hdr->last_file_offset);
hdr->flushed_file_offset = le64_to_cpu(hdr->flushed_file_offset);
hdr->last_file_offset = le64_to_cpu(hdr->last_file_offset);
}
void vhdx_log_entry_hdr_le_export(VHDXLogEntryHeader *hdr)
{
assert(hdr != NULL);
cpu_to_le32s(&hdr->signature);
cpu_to_le32s(&hdr->checksum);
cpu_to_le32s(&hdr->entry_length);
cpu_to_le32s(&hdr->tail);
cpu_to_le64s(&hdr->sequence_number);
cpu_to_le32s(&hdr->descriptor_count);
hdr->signature = cpu_to_le32(hdr->signature);
hdr->checksum = cpu_to_le32(hdr->checksum);
hdr->entry_length = cpu_to_le32(hdr->entry_length);
hdr->tail = cpu_to_le32(hdr->tail);
hdr->sequence_number = cpu_to_le64(hdr->sequence_number);
hdr->descriptor_count = cpu_to_le32(hdr->descriptor_count);
cpu_to_leguids(&hdr->log_guid);
cpu_to_le64s(&hdr->flushed_file_offset);
cpu_to_le64s(&hdr->last_file_offset);
hdr->flushed_file_offset = cpu_to_le64(hdr->flushed_file_offset);
hdr->last_file_offset = cpu_to_le64(hdr->last_file_offset);
}
@ -150,18 +150,18 @@ void vhdx_region_header_le_import(VHDXRegionTableHeader *hdr)
{
assert(hdr != NULL);
le32_to_cpus(&hdr->signature);
le32_to_cpus(&hdr->checksum);
le32_to_cpus(&hdr->entry_count);
hdr->signature = le32_to_cpu(hdr->signature);
hdr->checksum = le32_to_cpu(hdr->checksum);
hdr->entry_count = le32_to_cpu(hdr->entry_count);
}
void vhdx_region_header_le_export(VHDXRegionTableHeader *hdr)
{
assert(hdr != NULL);
cpu_to_le32s(&hdr->signature);
cpu_to_le32s(&hdr->checksum);
cpu_to_le32s(&hdr->entry_count);
hdr->signature = cpu_to_le32(hdr->signature);
hdr->checksum = cpu_to_le32(hdr->checksum);
hdr->entry_count = cpu_to_le32(hdr->entry_count);
}
void vhdx_region_entry_le_import(VHDXRegionTableEntry *e)
@ -169,9 +169,9 @@ void vhdx_region_entry_le_import(VHDXRegionTableEntry *e)
assert(e != NULL);
leguid_to_cpus(&e->guid);
le64_to_cpus(&e->file_offset);
le32_to_cpus(&e->length);
le32_to_cpus(&e->data_bits);
e->file_offset = le64_to_cpu(e->file_offset);
e->length = le32_to_cpu(e->length);
e->data_bits = le32_to_cpu(e->data_bits);
}
void vhdx_region_entry_le_export(VHDXRegionTableEntry *e)
@ -179,9 +179,9 @@ void vhdx_region_entry_le_export(VHDXRegionTableEntry *e)
assert(e != NULL);
cpu_to_leguids(&e->guid);
cpu_to_le64s(&e->file_offset);
cpu_to_le32s(&e->length);
cpu_to_le32s(&e->data_bits);
e->file_offset = cpu_to_le64(e->file_offset);
e->length = cpu_to_le32(e->length);
e->data_bits = cpu_to_le32(e->data_bits);
}
@ -190,16 +190,16 @@ void vhdx_metadata_header_le_import(VHDXMetadataTableHeader *hdr)
{
assert(hdr != NULL);
le64_to_cpus(&hdr->signature);
le16_to_cpus(&hdr->entry_count);
hdr->signature = le64_to_cpu(hdr->signature);
hdr->entry_count = le16_to_cpu(hdr->entry_count);
}
void vhdx_metadata_header_le_export(VHDXMetadataTableHeader *hdr)
{
assert(hdr != NULL);
cpu_to_le64s(&hdr->signature);
cpu_to_le16s(&hdr->entry_count);
hdr->signature = cpu_to_le64(hdr->signature);
hdr->entry_count = cpu_to_le16(hdr->entry_count);
}
void vhdx_metadata_entry_le_import(VHDXMetadataTableEntry *e)
@ -207,16 +207,16 @@ void vhdx_metadata_entry_le_import(VHDXMetadataTableEntry *e)
assert(e != NULL);
leguid_to_cpus(&e->item_id);
le32_to_cpus(&e->offset);
le32_to_cpus(&e->length);
le32_to_cpus(&e->data_bits);
e->offset = le32_to_cpu(e->offset);
e->length = le32_to_cpu(e->length);
e->data_bits = le32_to_cpu(e->data_bits);
}
void vhdx_metadata_entry_le_export(VHDXMetadataTableEntry *e)
{
assert(e != NULL);
cpu_to_leguids(&e->item_id);
cpu_to_le32s(&e->offset);
cpu_to_le32s(&e->length);
cpu_to_le32s(&e->data_bits);
e->offset = cpu_to_le32(e->offset);
e->length = cpu_to_le32(e->length);
e->data_bits = cpu_to_le32(e->data_bits);
}

4
block/vhdx-log.c
View File

@ -835,11 +835,11 @@ static void vhdx_log_raw_to_le_sector(VHDXLogDescriptor *desc,
/* 8 + 4084 + 4 = 4096, 1 log sector */
memcpy(&desc->leading_bytes, data, 8);
data += 8;
cpu_to_le64s(&desc->leading_bytes);
desc->leading_bytes = cpu_to_le64(desc->leading_bytes);
memcpy(sector->data, data, 4084);
data += 4084;
memcpy(&desc->trailing_bytes, data, 4);
cpu_to_le32s(&desc->trailing_bytes);
desc->trailing_bytes = cpu_to_le32(desc->trailing_bytes);
data += 4;
sector->sequence_high = (uint32_t) (seq >> 32);

18
block/vhdx.c
View File

@ -156,7 +156,7 @@ uint32_t vhdx_update_checksum(uint8_t *buf, size_t size, int crc_offset)
memset(buf + crc_offset, 0, sizeof(crc));
crc = crc32c(0xffffffff, buf, size);
cpu_to_le32s(&crc);
crc = cpu_to_le32(crc);
memcpy(buf + crc_offset, &crc, sizeof(crc));
return crc;
@ -753,8 +753,8 @@ static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s)
goto exit;
}
le32_to_cpus(&s->params.block_size);
le32_to_cpus(&s->params.data_bits);
s->params.block_size = le32_to_cpu(s->params.block_size);
s->params.data_bits = le32_to_cpu(s->params.data_bits);
/* We now have the file parameters, so we can tell if this is a
@ -803,9 +803,9 @@ static int vhdx_parse_metadata(BlockDriverState *bs, BDRVVHDXState *s)
goto exit;
}
le64_to_cpus(&s->virtual_disk_size);
le32_to_cpus(&s->logical_sector_size);
le32_to_cpus(&s->physical_sector_size);
s->virtual_disk_size = le64_to_cpu(s->virtual_disk_size);
s->logical_sector_size = le32_to_cpu(s->logical_sector_size);
s->physical_sector_size = le32_to_cpu(s->physical_sector_size);
if (s->params.block_size < VHDX_BLOCK_SIZE_MIN ||
s->params.block_size > VHDX_BLOCK_SIZE_MAX) {
@ -985,7 +985,7 @@ static int vhdx_open(BlockDriverState *bs, QDict *options, int flags,
/* endian convert, and verify populated BAT field file offsets against
* region table and log entries */
for (i = 0; i < s->bat_entries; i++) {
le64_to_cpus(&s->bat[i]);
s->bat[i] = le64_to_cpu(s->bat[i]);
if (payblocks--) {
/* payload bat entries */
if ((s->bat[i] & VHDX_BAT_STATE_BIT_MASK) ==
@ -1509,7 +1509,7 @@ static int vhdx_create_new_metadata(BlockBackend *blk,
mt_file_params->block_size = cpu_to_le32(block_size);
if (type == VHDX_TYPE_FIXED) {
mt_file_params->data_bits |= VHDX_PARAMS_LEAVE_BLOCKS_ALLOCED;
cpu_to_le32s(&mt_file_params->data_bits);
mt_file_params->data_bits = cpu_to_le32(mt_file_params->data_bits);
}
vhdx_guid_generate(&mt_page83->page_83_data);
@ -1656,7 +1656,7 @@ static int vhdx_create_bat(BlockBackend *blk, BDRVVHDXState *s,
sinfo.file_offset = ROUND_UP(sinfo.file_offset, MiB);
vhdx_update_bat_table_entry(blk_bs(blk), s, &sinfo, &unused, &unused,
block_state);
cpu_to_le64s(&s->bat[sinfo.bat_idx]);
s->bat[sinfo.bat_idx] = cpu_to_le64(s->bat[sinfo.bat_idx]);
sector_num += s->sectors_per_block;
}
ret = blk_pwrite(blk, file_offset, s->bat, length, 0);

12
block/vhdx.h
View File

@ -420,16 +420,16 @@ int vhdx_log_write_and_flush(BlockDriverState *bs, BDRVVHDXState *s,
static inline void leguid_to_cpus(MSGUID *guid)
{
le32_to_cpus(&guid->data1);
le16_to_cpus(&guid->data2);
le16_to_cpus(&guid->data3);
guid->data1 = le32_to_cpu(guid->data1);
guid->data2 = le16_to_cpu(guid->data2);
guid->data3 = le16_to_cpu(guid->data3);
}
static inline void cpu_to_leguids(MSGUID *guid)
{
cpu_to_le32s(&guid->data1);
cpu_to_le16s(&guid->data2);
cpu_to_le16s(&guid->data3);
guid->data1 = cpu_to_le32(guid->data1);
guid->data2 = cpu_to_le16(guid->data2);
guid->data3 = cpu_to_le16(guid->data3);
}
void vhdx_header_le_import(VHDXHeader *h);

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